 \begin{tabular}{l*{4}{c}} \hline \hline \noalign{\smallskip}
		& \multicolumn{2}{c}{\shortstack{Elasticity of\\college graduate quality\\with GDP per worker}} & \multicolumn{2}{c}{\shortstack{Correlation\\with baseline}}     \\
		 \cmidrule(l){2-3}  \cmidrule(l){4-5}  
		& \multicolumn{1}{c}{\shortstack{Top\\colleges}} & \multicolumn{1}{c}{\shortstack{Non-top\\colleges}} & \multicolumn{1}{c}{\shortstack{College\\graduate\\quality}} & \multicolumn{1}{c}{\shortstack{Skill\\prices}}   \\ 
\hline \noalign{\smallskip} 
1. Baseline       		&     0.209\sym{***}&    0.259\sym{***}								& 1.00 	& 1.00 \\
                &  (0.045)         &  (0.039)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
2. Projection on GDPPW 	 & 0.181\sym{***}&    0.256\sym{***} 							& 0.89 	& 0.60 \\
                &  (0.060)         &  (0.050)     & &    \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
3. Include job title fixed effects     &     0.162\sym{***}&    0.214\sym{***}						& 0.87 	& 0.98 \\
                &  (0.034)         &  (0.028)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
4. Include firm fixed effects &     0.201\sym{***}&    0.236\sym{***}							& 0.90 	& 0.97 \\
                &  (0.034)         &  (0.031)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
5. Include metropolitan area fixed effects &     0.208\sym{***}&    0.257\sym{***}				& 0.93 	& 1.00 \\
                &  (0.045)         &  (0.039)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
6. Only migrations with 4+ years between observations &     0.191\sym{***}&    0.228\sym{***}		& 0.99 	& 0.98 \\
                &  (0.062)         &  (0.055)     & &     \\
               &       [27]         &       [30]     & &     \\
\noalign{\smallskip}
7. Sample selection correction 		&      0.213\sym{**} &    0.284\sym{***}					& 0.96 	& 0.89 \\
                &  (0.079)         &  (0.086)     & &     \\
               &       [16]         &       [17]     & &     \\
\noalign{\smallskip}
8. Include college graduates employed abroad 	& 0.141\sym{***}&    0.174\sym{***}	& 0.97 	& 1.00 \\
                &  (0.033)         &  (0.034)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
9. Exclude the United States		& 0.174\sym{***}&    0.233\sym{***}					& 0.96 	& 0.98 \\
                &  (0.044)         &  (0.038)     & &     \\
               &       [39]         &       [42]     & &     \\
\noalign{\smallskip}
10. Minimum N=50 observations &       0.192\sym{***}&    0.246\sym{***}						& 1.00 	& 1.00 \\
                &  (0.056)         &  (0.050)     & &     \\
               &       [32]         &       [32]     & &     \\
\noalign{\smallskip}
11. Include variable-based compensation &       0.206\sym{***}&    0.256\sym{***}				& 1.00 	& 1.00 \\
                &  (0.047)         &  (0.041)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
12. Alternative sample truncation &       0.198\sym{***}&    0.245\sym{***}						& 0.99 	& 0.99 \\
                &  (0.044)         &  (0.038)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
13. Include job number fixed effects   &       0.204\sym{***}&    0.253\sym{***}					& 1.00 	& 1.00 \\
                &  (0.045)         &  (0.039)     & &     \\
               &       [43]         &       [46]     & &     \\
\noalign{\smallskip}
14. Include major of study fixed effects 	& 0.213\sym{***}&    0.268\sym{***}				& 0.97 	& 0.99 \\
                &  (0.045)         &  (0.043)     & &     \\
               &       [39]         &       [44]     & &     \\
\noalign{\smallskip}
15. At most an undergraduate degree 		& 0.170\sym{***}&    0.249\sym{***}				& 0.98 	& 0.99 \\
                &  (0.054)         &  (0.049)     & &     \\
               &       [35]         &       [37]     & &     \\
\noalign{\smallskip}
16. Jointly estimate undergraduate and graduate quality 	& 0.223\sym{***}&    0.266\sym{***}	& 0.99 	& 1.00 \\
                &  (0.051)         &  (0.040)     & &     \\
               &       [43]         &       [46]     & &     \\
 \hline \hline \noalign{\smallskip}
 \end{tabular} 
